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Freeze a CEK state to pure s-expressions. Thaw it back to a live state and resume with cek-run. Full round-trip through SX text works: freeze → sx-serialize → sx-parse → thaw → resume → same result. - cek-freeze: serialize control/env/kont/value to SX dicts - cek-thaw: reconstruct live state from frozen SX - Native functions serialize as (primitive "name"), looked up on resume - Lambdas serialize as (lambda (params) body) - Environments serialize as flat dicts of visible bindings - Continuation frames serialize as typed dicts Enables: localStorage persistence, content-addressed computation, cross-machine migration, time-travel debugging. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>